public function delete($id, Request $request, Application $app)
 {
     $event = new Event($app['dbconn']);
     if ($event->isEventExist($id)) {
         $error = array("message" => "Event {$id} does not exist.");
         return $app->json($error, 403);
     }
     try {
         $result = $app['dbconn']->delete('events', array('id' => $id));
         if ($result) {
             return $app->json(array("message" => "Event {$id} is deleted!"), 201);
         } else {
             return $app->json($issue_post, 403);
         }
     } catch (\Exception $e) {
         $error = array("message" => $e->getMessage());
         return $app->json($error, 403);
     }
 }